4. Tensile strength tests were carried out on two difference grades of wire rod, resultingin the accompanying data. Tensile strength is normally distributed for both grades ofwire rod. Assume the population standard deviations are unequal. df= 22.51Sample Mean(kg/mm²)123.6GradeSample SizeSample SDAISI 1078AISI 1064142.012107.61.3c) Estimate with the mean difference in strength between the 1078 grade and the 1064grade with 90% confidence.d) Does the data provide compelling evidence for concluding that the true averagestrength of the 1078 grade is higher than 123 kg/mm?? Test the appropriatehypotheses using the p-value approach at the .01 level.

Answer: (14.879 , 17.121) ==================== d) P-value = 0.1411 , Fail to reject Ho

4. Tensile strength tests were carried out on two difference grades of wire rod, resulting in the accompanying data. Tensile strength is normally distributed for both grades of wire rod. Assume the population standard deviations are unequal. df= 22.51 Sample Mean (kg/mm²). 123.6 Grade Sample Size Sample SD AISI 1078 14 2.0 AISI 1064 12 107.6 1.3 c) Estimate with the mean difference in strength between the 1078 grade and the 1064 grade with 90% confidence. d) Does the data provide compelling evidence for concluding that the true average strength of the 1078 grade is higher than 123 kg/mm?? Test the appropriate hypotheses using the p-value approach at the .01 level.

4. Tensile strength tests were carried out on two difference grades of wire rod, resulting in the accompanying data. Tensile strength is normally distributed for both grades of wire rod. Assume the population standard deviations are unequal. df= 22.51 Sample Mean (kg/mm²). 123.6 Grade Sample Size Sample SD AISI 1078 14 2.0 AISI 1064 12 107.6 1.3 c) Estimate with the mean difference in strength between the 1078 grade and the 1064 grade with 90% confidence. d) Does the data provide compelling evidence for concluding that the true average strength of the 1078 grade is higher than 123 kg/mm?? Test the appropriate hypotheses using the p-value approach at the .01 level.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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